extends Node3D
class_name WorldManager

const PACK_DELAY : float = .15

var level : Level
var paths : Array[Node]

var wave : int = 0
var currentTroopIdx : int = 0
var currentTroop : Troop :
	get():
		return level.waves[wave - 1].troops[currentTroopIdx]
var enemiesAlive : int = 0
@onready var troopTimer : Timer = $TroopTimer


func _ready() -> void:
	EventBus.projectile_shooted.connect(onProjectileShooted)
	EventBus.player_defeated.connect(queue_free)


func onProjectileShooted(projectile: Projectile, startPosition: Vector3) -> void:
	add_child(projectile)
	projectile.global_position = startPosition


func _process(_delta: float) -> void:
	if wave > 0 || level && level.auto_start:
		spawnManager()


func spawnNextWave() -> void:
	if wave == level.waves.size() && currentTroopIdx == level.waves[wave - 1].troops.size():
		EventBus.player_has_won.emit()
		queue_free.call_deferred()
		return

	currentTroopIdx = 0
	wave += 1
	EventBus.waveHasChange.emit(wave)


func spawnTroop() -> void:
	var enemyScene : PackedScene = load(currentTroop.enemy)
	var totalDelay : float = 0
	for n in currentTroop.number_to_spawn:
		spawnEnemy(enemyScene, currentTroop.lane_to_spawn, totalDelay)
		totalDelay += PACK_DELAY

	currentTroopIdx += 1


func spawnEnemy(enemyScene: PackedScene, laneToSpawn: int, delay: float) -> void:
	var enemy : PathFollow3D = createEnemy(enemyScene)

	if delay > 0:
		var enemyTimer : Timer = createTimer(delay)
		enemyTimer.timeout.connect(
			func():
				paths[laneToSpawn].add_child(enemy)
				enemyTimer.queue_free()
		)
		add_child(enemyTimer)
	else:
		paths[laneToSpawn].add_child(enemy)

	enemiesAlive += 1


func createEnemy(enemyScene: PackedScene) -> PathFollow3D :
	var PF3D : PathFollow3D = enemyScene.instantiate()
	var enemy : Enemy = PF3D.find_children("*", "Enemy")[0]
	enemy.died.connect(func(): enemiesAlive -= 1)

	return PF3D


func spawnManager() -> void:
	if not troopTimer.is_stopped():
		return

	var current_wave : Wave = level.waves[wave - 1]
	if current_wave.troops.size() < currentTroopIdx + 1:
		if enemiesAlive == 0:
			spawnNextWave()
		return

	if currentTroop.spawn_delay == 0:
		spawnTroop()
	else:
		troopTimer.start(currentTroop.spawn_delay)


func createTimer(delay: float) -> Timer :
	var timer : Timer = Timer.new()
	timer.wait_time = delay
	timer.one_shot = true
	timer.autostart = true

	return timer


func addMap(mapScene : PackedScene) -> void:
	var map : Map = mapScene.instantiate()
	add_child(map)
	level = map.level
	paths = map.paths.get_children()
	EventBus.allowedTowerHasChange.emit(level.allowedTowers)
	spawnNextWave()